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Geigerite

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Thomas Geiger (1920 - 1990)
Formula:
Mn2+5(AsO4)2(HAsO4)2 · 10H2O
Hardness:
3
Crystal System:
Triclinic
Name:
Named after Dr. Thomas Geiger (1920 - 1990), Swiss mineralogist and metallurgist in the machinery industry and specialist for the manganese ores and minerals of Falotta and Alp Parsettens to which he devoted his PhD thesis and a series of later studies.
The manganese analogue of chudobaite.


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Classification of GeigeriteHide

Approved
Approval Year:
1985
8.CE.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
39.2.6.2

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
20.8.10

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn

Physical Properties of GeigeriteHide

Hardness:

Optical Data of GeigeriteHide

Type:
Biaxial (-)
RI values:
nα = 1.601 nβ = 1.630 nγ = 1.660
2V:
Measured: 89° , Calculated: 88°
Max Birefringence:
δ = 0.059
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of GeigeriteHide

Formula:
Mn2+5(AsO4)2(HAsO4)2 · 10H2O
IMA Formula:
Mn2+5(AsO4)2(AsO3OH)2 · 10H2O

Crystallography of GeigeriteHide

Crystal System:
Triclinic
Cell Parameters:
a = 7.94 Å, b = 10.69 Å, c = 6.77 Å
α = 80.97°, β = 84.2°, γ = 81.85°
Ratio:
a:b:c = 0.743 : 1 : 0.633
Unit Cell V:
560.3 ų

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.45 (100)
7.85 (13)
3.507 (21)
3.340 (20)
3.051 (24)
3.011 (17)
2.786 (14)

Type Occurrence of GeigeriteHide

Synonyms of GeigeriteHide

Other Language Names for GeigeriteHide

German:Geigerit
Spanish:Geigerita

Relationship of Geigerite to other SpeciesHide

Other Members of this group:
Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1

Related Minerals - Nickel-Strunz GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.10NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.15BrassiteMg(HAsO4) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
8.CE.20RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2OMon.
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet.
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon.
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2OMon.
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

39.2.6.1Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
39.2.6.1LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
39.2.6.4VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
39.2.6.5PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
39.2.6.6OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.8.1SarkiniteMn2+2(AsO4)(OH)Mon. 2/m : P2/m
20.8.2EveiteMn2+2(AsO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
20.8.3ArsenoclasiteMn2+5(AsO4)2(OH)4Orth.
20.8.4FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth.
20.8.5JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
20.8.6AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
20.8.7KrautiteMn(HAsO4) · H2OMon. 2 : P21
20.8.8SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2OTric. 1 : P1
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2OMon. 2/m : P21/b
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2OTric. 1 : P1
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
20.8.16WallkilldelliteCa2Mn2+3(AsO4)2(OH)4 · 9H2OHex.
20.8.17Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.18ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
20.8.22GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for GeigeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989): Geigerite, the manganese analogue of chudobaite: Its description and crystal structure. American Mineralogist: 74, 676-684.

Internet Links for GeigeriteHide

Localities for GeigeriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy
 
  • Liguria
    • La Spezia Province
      • Rocchetta Vara
Cabella, R., Basso, R., Lucchetti, G., Palenzona, A. (2000): Geigerite from Mt. Nero manganese mine (Northern Appennines, La Spezia, Italy). Neues Jahrbuch für Mineralogie, 12, 570-576.
Japan
 
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
        • Iwaki City
Kato et al (1990) Ganseki-Koubutsu-Koshogaku Zasshi, 85, 184.; Mineralogical Journal Vol. 18 (1996) , No. 4 pp 155-160
Romania
 
  • Hunedoara Co.
    • Deva
Collected by Gábor Koller, XRD and EDS: Sándor Szakáll and Béla Fehér
Saudi Arabia
 
  • Mintaqah Al Madinah
Faheha, A. A., Hamidalddin, S. Q., Al-Turkestany, N. A., & Ibraheim, N. M. (2012). Concentrations Of Natural And Man-Made Radioactivity Of Surface Soil In Al-Madinh Al-Monawarah, Western Province of Saudi Arabia. Isotope and Radiation Research, 44(2), 495-504.
Switzerland (TL)
 
  • Grischun (Grisons; Graubünden)
    • Albula Valley
      • Oberhalbstein (Surses; Sursass)
        • Tinizong (Tinzen)
Amer.Mineralogist 74, pages 676 - 684.
    • Hinterrhein Valley
      • Rheinwald
        • Splügen
Raman & EDX through AMI identificaton service. Found in 2010 by Claudio Leporatti; pers. comm. Roberto Bracco (2015)
Mineral and/or Locality  
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